Shutdown error messages | sd-umoun | ACPI BIOS Error (bug)

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I’ve done a system update recently via pamac, rebooted. Now I get following errors every time I power off the machine:

sd-umoun: Failed to unmount /oldroot: Device or resource busy
sd-umoun: Failed to unmount 20: No such file or directory
ACPI BIOS Error (bug): Could not resolve [\_PR.CPU0._PPC], AE_NOT_FOUND (20180810/psargs-330)
ACPI Error: Method parse/execution failed \_PTS, AE_NOT_FOUND (20180810/psparse-514)

The first couple most likely was caused by systemd update, but I’m really confused about the ACPI related ones.
Please help to diagnose them

Just for the record
CPU: Intel Celeron N4000
Kernel version: 4.19

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In principle you can ignore them. AFAIK the first two are related to systemd …
The last two might be related to an outdated BIOS on your machine (apparently a Laptop by the CPU description). How about the 5.4 LTS kernel, same issue?

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Thanks for replying.
I’ll try to install a new kernel and inform you when I’m done.

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